﻿using System;

namespace ConsoleApp10
{
    class Program
    {
        static void Main(string[] args)
        {
            
                string str = Console.ReadLine();
                if (str.IndexOf(",") != -1)
                {
                    str = str.Replace(",", "_");
                }
                Console.WriteLine("替换后的字符串为：" + str);
            
        }
    }
}
